Year Viewership
1980 52.1
1981 50.1
1982 47.7
1983 48.3
1984 46.3
1985 48
1986 45.8
1987 45.4
1988 42.2
1989 41.8
1990 41
1991 41.2
1992 41.7
1993 40.7
1994 39
1995 35.7
1996 34.5
1997 34.7
1998 32.1
1999 32
2000 31.9
2001 32.9
2002 30.1
2003 29.3
2004 28.8
2005 27
2006 26.1
2007 24.7
2008 24.5
2009 23.6
2010 23.2
2011 23.7
2012 24.7
2013 24.4
2014 25.7

Source: Nielsen Media Research

Note: For month of November